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# Word Problems on Negative Number Addition and Subtraction

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Example: A city has a temperature -16°F in the morning. If the temperature rises by 5°F in the afternoon, what is the temperature in the afternoon?

Temperature in the morning = -16°F

When temperature rises by 5°F in the afternoon, then temperature in afternoon = -16°F + 5°F = -11°F

Example: Ronnie swam 75 feet below the surface of a river. He then climbs up 39 feet. What is his depth from the surface of river now?

When Ronnie swam 75 feet below the surface of a river, his depth = -75 feet

Then he climbs 39 feet, so Ronnie’s depth now = -75 + 39 = -36 feet

#### Check Point

1. A submarine was situated at 600 feet below sea level. If it descends 200 feet, then what is the new position of the submarine?

1. Daisy scored 600 points in the first half of trivia game. If she lost 700 points in the second half, then what is her present score?

1. An air pilot took off the plane from 1300 feet above sea level. If the plane descended 600 feet, what is the elevation of the plane now?

1. If the temperature was -5°C on Monday and -7°C on Tuesday, then what is the change in temperature from Monday to Tuesday?
2. In 753 BC, Rome is founded by Romulus. In 509 BC Rome expels the last of its 7 kings and starts a republic. After how many years of its foundation, Rome started a republic?

1. -800 feet
2. -100 points
3. 700 feet
4. -2°C
5. 244 years

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